"""
MCP 请求处理器
实现不同类型 MCP 请求的处理逻辑
"""

import asyncio
import json
import logging
from abc import ABC, abstractmethod
from typing import Any, Dict, List, Optional, Type

from ..client.protocol import MCPRequest, MCPResponse

class BaseHandler(ABC):
    """基础请求处理器"""
    
    def __init__(self):
        self.logger = logging.getLogger(__name__)
        
    @abstractmethod
    async def handle(self, request: MCPRequest) -> MCPResponse:
        """处理请求
        
        Args:
            request: MCP 请求
            
        Returns:
            MCPResponse: MCP 响应
        """
        pass
        
class QueryHandler(BaseHandler):
    """查询处理器
    
    处理数据查询相关的请求
    """
    
    async def handle(self, request: MCPRequest) -> MCPResponse:
        try:
            # 解析查询参数
            query = request.data.get("query")
            filters = request.data.get("filters", {})
            limit = request.data.get("limit", 10)
            
            # TODO: 实现查询逻辑
            results = await self._execute_query(query, filters, limit)
            
            return MCPResponse(
                request_id=request.request_id,
                status="success",
                data={"results": results}
            )
            
        except Exception as e:
            self.logger.error(f"Query error: {e}")
            return MCPResponse(
                request_id=request.request_id,
                status="error",
                error=str(e)
            )
            
    async def _execute_query(self, query: str, filters: Dict, limit: int) -> List[Dict]:
        """执行查询
        
        Args:
            query: 查询语句
            filters: 过滤条件
            limit: 结果限制
            
        Returns:
            List[Dict]: 查询结果
        """
        # TODO: 实现具体的查询执行逻辑
        return []
        
class UpdateHandler(BaseHandler):
    """更新处理器
    
    处理数据更新相关的请求
    """
    
    async def handle(self, request: MCPRequest) -> MCPResponse:
        try:
            # 解析更新参数
            entity_id = request.data.get("entity_id")
            updates = request.data.get("updates", {})
            
            # TODO: 实现更新逻辑
            success = await self._execute_update(entity_id, updates)
            
            return MCPResponse(
                request_id=request.request_id,
                status="success" if success else "error",
                data={"updated": success}
            )
            
        except Exception as e:
            self.logger.error(f"Update error: {e}")
            return MCPResponse(
                request_id=request.request_id,
                status="error",
                error=str(e)
            )
            
    async def _execute_update(self, entity_id: str, updates: Dict) -> bool:
        """执行更新
        
        Args:
            entity_id: 实体ID
            updates: 更新内容
            
        Returns:
            bool: 是否更新成功
        """
        # TODO: 实现具体的更新执行逻辑
        return True
        
class AnalysisHandler(BaseHandler):
    """分析处理器
    
    处理数据分析相关的请求
    """
    
    async def handle(self, request: MCPRequest) -> MCPResponse:
        try:
            # 解析分析参数
            data = request.data.get("data", [])
            analysis_type = request.data.get("type")
            params = request.data.get("params", {})
            
            # TODO: 实现分析逻辑
            results = await self._execute_analysis(data, analysis_type, params)
            
            return MCPResponse(
                request_id=request.request_id,
                status="success",
                data={"results": results}
            )
            
        except Exception as e:
            self.logger.error(f"Analysis error: {e}")
            return MCPResponse(
                request_id=request.request_id,
                status="error",
                error=str(e)
            )
            
    async def _execute_analysis(self, data: List, analysis_type: str, params: Dict) -> Dict:
        """执行分析
        
        Args:
            data: 分析数据
            analysis_type: 分析类型
            params: 分析参数
            
        Returns:
            Dict: 分析结果
        """
        # TODO: 实现具体的分析执行逻辑
        return {}
        
class StreamHandler(BaseHandler):
    """流处理器
    
    处理流式数据相关的请求
    """
    
    async def handle(self, request: MCPRequest) -> MCPResponse:
        try:
            # 解析流参数
            stream_id = request.data.get("stream_id")
            action = request.data.get("action")
            params = request.data.get("params", {})
            
            # TODO: 实现流处理逻辑
            result = await self._handle_stream(stream_id, action, params)
            
            return MCPResponse(
                request_id=request.request_id,
                status="success",
                data={"result": result}
            )
            
        except Exception as e:
            self.logger.error(f"Stream error: {e}")
            return MCPResponse(
                request_id=request.request_id,
                status="error",
                error=str(e)
            )
            
    async def _handle_stream(self, stream_id: str, action: str, params: Dict) -> Any:
        """处理流
        
        Args:
            stream_id: 流ID
            action: 操作类型
            params: 操作参数
            
        Returns:
            Any: 处理结果
        """
        # TODO: 实现具体的流处理逻辑
        return None
        
class HandlerFactory:
    """处理器工厂
    
    根据请求类型创建对应的处理器
    """
    
    _handlers: Dict[str, Type[BaseHandler]] = {
        "query": QueryHandler,
        "update": UpdateHandler,
        "analysis": AnalysisHandler,
        "stream": StreamHandler
    }
    
    @classmethod
    def create(cls, request_type: str) -> Optional[BaseHandler]:
        """创建处理器
        
        Args:
            request_type: 请求类型
            
        Returns:
            Optional[BaseHandler]: 处理器实例
        """
        handler_class = cls._handlers.get(request_type)
        if handler_class:
            return handler_class()
        return None
        
    @classmethod
    def register(cls, request_type: str, handler_class: Type[BaseHandler]):
        """注册处理器
        
        Args:
            request_type: 请求类型
            handler_class: 处理器类
        """
        cls._handlers[request_type] = handler_class 